<style> 
mermaid.flowchartConfig = {  
width: 50; 
}
</style>
```mermaid

	sequenceDiagram 
		Alice->>+John: Hello John, how are you?
	    Alice->>+John: John, can you hear me?
	    John-->>-Alice: Hi Alice, I can hear you!
	    John-->>-Alice: I feel great! 
```
